#include "./stdc++.hpp"
using namespace std;

// Definition for singly-linked list.
struct ListNode {
    int val;
    ListNode *next;
    ListNode(int x) : val(x), next(NULL) {}
};

class Solution {
 public:
};

int main() {
    string line;
    while (getline(cin, line)) {
    }
    return 0;
}